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We obtain optimal regularity in the Sobolev space $W_0^{1,\tau}(\Omega)$ forthe unique solution of $$ -\Delta_m u=K(x)u^{-p} \mbox{in} \Omega, \quadu=0\mbox{on}\partial \Omega. $$ Here $\Omega\subset{\mathbb R}^N$ is a smoothand bounded domain, $m>1$, $p\geq 0$ and $K\in C(\Omega)$ is a positivefunction that behaves like ${\rm dist}(x,\partial\Omega)^{-q}$ for some $q\geq0$ with $p+q< 2-\frac{1-p}{m}$.  We obtain that the unique weak solution to the above problem belongs to$W_0^{1,\tau}(\Omega)$ for $$ m\leq \tau<\frac{m+p-1}{p+q-1}\quad\mbox{if}p+q>1, $$ and $$ m\leq \tau<\infty\quad \mbox{if}p+q=1. $$ The aboverange of $\tau$ is optimal.

Regularity of Weak Solutions for Singular Elliptic Problems Driven by m-Laplace Operator